HTTP Header Builder
Compose request or response headers once, then export them as raw text, JSON or JavaScript objects.
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Header Output
About HTTP Header Builder
This HTTP header builder helps you compose headers once and export them as raw text, JSON or a JavaScript headers object.
Header Export Formats
// Input (raw headers)
Content-Type: application/json
Authorization: Bearer token123
// Output: Raw format
Content-Type: application/json
Authorization: Bearer token123
// Output: JSON format
{
"Content-Type": "application/json",
"Authorization": "Bearer token123"
}
// Output: JavaScript fetch format
const headers = {
"Content-Type": "application/json",
"Authorization": "Bearer token123"
};
Common HTTP Headers
| Header | Use Case |
|---|---|
Content-Type |
Specify body media type (json, form-data) |
Authorization |
Send credentials (Bearer, Basic, API key) |
Accept |
Specify expected response format |
X-API-Key |
Send API key for authentication |
User-Agent |
Identify client application |
Frequently Asked Questions
- What is the standard HTTP header format?
- HTTP headers follow the format 'Header-Name: value' with one header per line. Header names are case-insensitive but conventionally use Title-Case (Content-Type, Authorization). Values are trimmed of whitespace. Example: 'Content-Type: application/json' or 'Authorization: Bearer token123'.
- How do I export headers for fetch API?
- Select the 'JavaScript fetch headers' format to export headers as a const object. Example output: 'const headers = { "Content-Type": "application/json", "Authorization": "Bearer token" };'. Use this directly in fetch calls: fetch(url, { headers }).
- What are common request headers?
- Common request headers include: Content-Type (media type of body), Authorization (credentials like Bearer tokens), Accept (expected response format), User-Agent (client identification), X-Requested-With (AJAX requests), and custom headers like X-API-Key for authentication.
- What is the difference between request and response headers?
- Request headers are sent by the client (browser) to the server (e.g., Authorization, Content-Type). Response headers are sent by the server to the client (e.g., Content-Type, Set-Cookie, Cache-Control, X-Frame-Options). Some headers like Content-Type appear in both but may have different values.